Who knows how to mend holes in knitted clothing?

A seamstress….?

try this: this is more like a ‘felting’ solution with no sewing
http://www.realsimple.com/beauty-fashion/clothing-care/cashmere-sweater-00100000108740/index.html

Here is a sewing tip: http://pambaumeister.blogspot.no/2011/02/how-to-fix-hole-in-your-cashmere.html

Here is a bunch of tips someone collected on Pinterest http://www.pinterest.com/dufieldfarm/fixing-holes-in-sweaters/

I, like a big dummy, wore my beautiful black cashmere sweater working. I make soap. I splashed lye water, because of the stupid water pressure at my old workshop (stupid landlord had the water shut off without telling us) and got holes in it. First. Day. I. Wore it. Damn it. I’m going to try the felting technique on it.

Correct, this would not be sewing, but it’ll kind of start out that way. First, take some thread on a needle and draw it through any “loose” loops. This will halt the progression of the holes – otherwise they can run more, like stockings, before and while you fix it.

Then get yourself a small size crochet hook (if the knit is loose enough to fit a crochet hook) or a hook rug tool. Then closely examine the knit – see how it’s a series of loops around more loops? Take the crochet/rug hook and use it to grasp one of the threads that has come out- the first one down from the row of “loose” loops you ran the thread through. Then remove the thread from just one loop and use the hook to draw the yarn-that-came-out through that loop. Then stick the thread through the new loop you just made, to hold it. Then do the next loose loop the same way, until you have fixed a row in the hole.

At some point you will find loose ends where the moths ate the yarn completely through. Do the same thing as above till it gets so short you cannot use those broken bits to loop through. Then use your hook to weave these ends back in on themselves. Ideally you will not have to tie knots, but there may be no other choice.

This all is the same principle as using a knit loom – you are doing one loop at a time, vertically, rather than across on a needle as regular knitting would do it.

Realistically, this is a difficult thing to describe using the written word, and I’m guessing no easier to pick up from your end. Your best bet is gonna be to find a fiber arts store or meetup group in your area and give then a call. They can usually repair this stuff for you or have you come in to show you in person. I’ll try to find a video here; 1 sec… prepare for edit… OK, here’s a video, but I haven’t watched it yet myself so I can’t vouch for how well it matches my directions above – though it’s almost certainly gonna be correct in it’s own way.

Am I the only one here who learned how to darn a sock? It’s the same process with a hole in a cashmere sweater. You need to find a fine yarn of a similar color if you can. Then you thread the yarn in a long needle, put the hole in the sweater over a darning egg (or the end of a baseball bat) and set up what is essentially a warp as you would in weaving.

Then you rotate the hole with its warp 90 degrees and weave, under and over, the woof until you have filled in the hole and the surrounding area.

Here’s a video
She uses a crochet hook and very coarse yarn but the mechanism is clear.